21101322423 has 16 divisors (see below), whose sum is σ = 30903540480. Its totient is φ = 12747708864.

The previous prime is 21101322419. The next prime is 21101322439. The reversal of 21101322423 is 32422310112.

It is not a de Polignac number, because 21101322423 - 2² = 21101322419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21101322423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101322023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8046486 + ... + 8049107.

It is an arithmetic number, because the mean of its divisors is an integer number (1931471280).

Almost surely, 2^21101322423 is an apocalyptic number.

21101322423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21101322423 is a deficient number, since it is larger than the sum of its proper divisors (9802218057).

21101322423 is a wasteful number, since it uses less digits than its factorization.

21101322423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16095638.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21101322423 its reverse (32422310112), we get a palindrome (53523632535).

The spelling of 21101322423 in words is "twenty-one billion, one hundred one million, three hundred twenty-two thousand, four hundred twenty-three".